Unlock instant, AI-driven research and patent intelligence for your innovation.

Fail determination device for vehicle automatic transmissions and control device for vehicle automatic transmissions

a technology for automatic transmissions and control devices, which is applied in the direction of control devices, gearing control, gearing elements, etc., can solve the problems of not reaching the selected shift stage, and achieve the effect of rapid start of failsafe control and increased chance of judgmen

Active Publication Date: 2020-03-17
JATCO LTD +1
View PDF22 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enhances the chances of accurate failure judgment by complementing the strengths of both judging means, enabling rapid initiation of failsafe control measures even when gear ratio deviation is not present, thereby improving vehicle transmission reliability.

Problems solved by technology

In this automatic transmission, when a failure is generated in the shift valve, the selected shift stage is not attained.
Besides, it is necessary to identify causes of the failure for performing appropriate failsafe control.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fail determination device for vehicle automatic transmissions and control device for vehicle automatic transmissions
  • Fail determination device for vehicle automatic transmissions and control device for vehicle automatic transmissions
  • Fail determination device for vehicle automatic transmissions and control device for vehicle automatic transmissions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023]Hereinafter, one embodiment according to the present invention is explained with reference to the drawings. In this embodiment, an automatic transmission including frictional engagement elements arranged to be engaged and disengaged by operations of solenoid valves is a stepped auxiliary transmission mechanism provided on an output side of a belt type continuously variable transmission (referred also merely to CVT). Besides, a rotation speed is represented as a rotation number (that is, a number of rotation per unit time).

[0024][1. Configuration of Driving System of Vehicle]

[0025]FIG. 1 is a configuration view showing a driving system of a vehicle on which a vehicular automatic transmission and a control device including a failure judgment device for the automatic transmission in this embodiment are mounted.

[0026]As shown in FIG. 1, this vehicle includes an engine 1 serving as a power source. An output rotation of the engine 1 is transmitted through a torque converter 2 with a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A failure judgment device of an automatic transmission includes: a first abnormality judging section configured to judge a power supply fault abnormality or a breaking abnormality of the solenoid, from a selected shift stage and a state of the transmission mechanism, after the detection of the electric abnormality; and a second abnormality judging section configured to judge the power supply abnormality or the breaking abnormality of the solenoid, from the monitor current value when the solenoid valve is switched to an OFF state, after the detection of the electric abnormality, when one of the first abnormality judging section and the second abnormality judging section judges the power supply fault abnormality or the breaking abnormality, the judgement result being outputted.

Description

TECHNICAL FIELD[0001]This invention relates to a failure judgment device for an automatic transmission of a vehicle, and a control device for the automatic transmission of the vehicle to which the failure judgment device is provided.BACKGROUND ART[0002]In an automatic transmission for a vehicle, a shift valve is normally a solenoid valve. The shift valve is switched by operating the solenoid so as to engage or disengage frictional engagement elements. With this, a shift stage is switched. In this automatic transmission, when a failure is generated in the shift valve, the selected shift stage is not attained. Accordingly, when the generation of the failure is sensed, a control (failsafe control) to suppress the failure influence is performed. Besides, it is necessary to identify causes of the failure for performing appropriate failsafe control.[0003]In a patent document 1, the gear ratio deviation is sensed from the selected shift stage, and the sensed actual gear ratio. Moreover, wh...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): F16H61/12B60W50/04B60W50/02F16H59/68F16H61/02F16H61/662F16H59/70
CPCF16H61/66236F16H59/68B60W50/04F16H61/12B60W50/045F16H61/02B60W50/0205F16H61/0213F16H2061/1268F16H2061/1288F16H2061/1208F16H2059/704F16H2059/706B60W2050/022F16H2061/1292B60W2050/021F16H59/70F16H61/662
Inventor TASAKA, HAJIMEITOU, YOUJIHAMANO, MASAHIROIIZUKA, NAONORIAMANO, NORIHIRAMOO, HEO CHANG
Owner JATCO LTD